globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-12-851-2018
Scopus记录号: 2-s2.0-85043517519
论文题名:
An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model
作者: Wang Y; , Zhang T; , Ren J; , Qin X; , Liu Y; , Sun W; , Chen J; , Ding M; , Du W; , Qin D
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期:3
起始页码: 851
结束页码: 866
语种: 英语
英文关键词: air temperature ; arid region ; borehole ; confluence ; equilibrium line ; heating ; ice flow ; in situ measurement ; temperature effect ; thermal structure ; thermomechanics ; two-dimensional flow ; valley glacier ; China ; Laohugou Glacier ; Qilian Mountains ; Xinjiang Uygur
英文摘要: By combining in situ measurements and a two-dimensional thermomechanically coupled ice flow model, we investigate the thermomechanical features of the largest valley glacier (Laohugou Glacier No. 12; LHG12) on Qilian Shan located in the arid region of western China. Our model results suggest that LHG12, previously considered as fully cold, is probably polythermal, with a lower temperate ice layer overlain by an upper layer of cold ice over a large region of the ablation area. Modelled ice surface velocities match well with the in situ observations in the east branch (main branch) but clearly underestimate those near the glacier terminus, possibly because the convergent flow is ignored and the basal sliding beneath the confluence area is underestimated. The modelled ice temperatures are in very good agreement with the in situ measurements from a deep borehole (110 m deep) in the upper ablation area. The model results are sensitive to surface thermal boundary conditions, for example surface air temperature and near-surface ice temperature. In this study, we use a Dirichlet surface thermal condition constrained by 20 m borehole temperatures and annual surface air temperatures. Like many other alpine glaciers, strain heating is important in controlling the englacial thermal structure of LHG12. Our transient simulations indicate that the accumulation zone becomes colder during the last two decades as a response to the elevated equilibrium line altitude and the rising summer air temperatures. We suggest that the extent of accumulation basin (the amount of refreezing latent heat from meltwater) of LHG12 has a considerable impact on the englacial thermal status. © 2018 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75404
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; University of Chinese, Academy of Sciences, Beijing, China; Institute of Polar Meteorology, Chinese Academy of Meteorological Sciences, Beijing, China; College of Geography and Environment, Shandong Normal University, Jinan, China; Fluid Dynamics and Solid Mechanics Group, Los Alamos National Laboratory, Los Alamos, NM, United States

Recommended Citation:
Wang Y,, Zhang T,, Ren J,et al. An investigation of the thermomechanical features of Laohugou Glacier No. 12 on Qilian Shan, western China, using a two-dimensional first-order flow-band ice flow model[J]. Cryosphere,2018-01-01,12(3)
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